[dune-fem] Preconditioning for BiCGSTAB and GMRES

[Sacconi, Andrea]

Hi all,

I have a quick question about the preconditioning.

So far I have written a linear operator for a system I need to solve.
Suppose I want to use a BiCGSTAB or a GMRES to solve the system; one option is to create an instance of Dune::Fem::OEMBICGSTABOp.
Since I want to pass to the solver my own preconditioner (derived from one paper in literature), how can I provide it correctly?
In addition, since it's a block preconditioner, I suspect I'll have to provide a solve () method, i.e. how to "invert" it numerically.

How can I do all these things in Dune-Fem?
Is there any special restriction with the type of grid functions (Adaptive vs. BlockVector type)?

Thanks in advance!

Andrea
__________________________________________________________

Andrea Sacconi
PhD student, Applied Mathematics
AMMP Section, Department of Mathematics, Imperial College London,
London SW7 2AZ, UK
a.sacconi11 at imperial.ac.uk
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